This is one of the popular sections in Teachnology. It features a library of original lesson plans with more than 30,000 lesson plans.
This is a great helper for teachers and I personally can't think about looking for teaching resources without having edHelper on top of the selection. edHelper provides a wide variety of lesson plans, worksheets, printables, themes and many other interesting materials for teachers.
3- Lesson Planet
Lesson Planet has provides a convenient way for teachers to discover and share innovative lesson-planning resources. The Lesson Planet solution helps teachers find lesson resources, correlate them to standards, and organize curriculum.
4- HotChalk Lesson Plans
HotChalk’s Lesson Plans Page (LPP) was created with one goal in mind — making life easier for teachers. You’ll find over 4,000 relevant lesson plans here, created by teachers, proven in the classroom, and absolutely, positively, completely… free! Choose from a wide range of subject-specific plans, available for all grade levels.
There is a section in Schoolastic that provides thousands of lesson plans, unit plans, discussion guides, and extension activities. You can use the search box to look for lesson plans
6- Microsoft Lesson Plans section
This is a page curated by the folks in Microsoft in Education and features hundreds of ready made lesson plans that you can use as they are or you can also customize them the way you want.
ReadWriteThink provides hundreds of standards-based lesson plans written and reviewed by educators using current research and the best instructional practices. Find the perfect one for your classroom.